<!DOCTYPE html>
<html lang="en">
<head>
    <!--元数据标签  描述数据的数据 数据的语义-->
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>主页面</title>
</head>
<body>
    <main>
        <header class="head">logo</header>
        <nav class="topMenu">
            <ul class="topMenu_ul">
                <li class="topMeun_li">
                    <nav>
                        <div class="topMenuImgs" id="toMenu_img_first"></div>
                        <a class="a_MenuClass" href="#">显示首页</a>
                    </nav>
                </li>
                <li class="topMenu_li">
                    <nav>
                        <div class="topMenuImgs" id="toMenu_img_article"></div>
                        <a id="a_insertArticle" class="a_MenuClass" href="#">写文章</a>
                    </nav>
                </li>
                <li class="topMenu_li">
                   <nav>
                        <div class="topMenuImgs" id="toMenu_img_articleType"></div>
                        <a class="a_Menuclass" href="#">文章类型</a>
                   </nav>
                </li>
                <li class="topMenu_li">
                   <nav>
                       <div class="topMenuImgs" id="toMenu_img_config"></div>
                       <a class="a_MenuClass" href="#">用户设置</a>
                   </nav>
                </li>
            </ul>
        </nav>
        <nav class="leftside">
            <!--行内样式  仅对标签内的内容生效-->
            <h2 style="text-align:center">文章类型</h2>
            <ul class="leftMenu_ul_level1">
                <li class="leftMenu_li_level1">
                    Java Core
                    <div class="leftMenuImgs"></div>
                </li>
                <ul class="leftMenu_ul_level2">
                        <li class="leftMenu_li_level2">面向对象</li>
                        <li class="leftMenu_li_level2">多线程</li>
                    </ul>
                <li class="leftMenu_li_level2">
                    Java Web
                    <div class="leftMenuImgs"></div>
                </li>
                <ul class="leftMenu_ul_level2"
            </ul>
        </nav>
        <section class="main">main page</section>
        <nav class="rightSide">right menu</nav>
        <footer class="foot">info</footer>
    </main>
</body>
</html>